The 22-year-old singer died on Friday at the Pukkelpop festival in Belgium. According to The AP, Haddon jumped from a telecommunications mast behind the main stage.

The band supported La Roux on their UK tour last year. Elly Jackson wrote on her Twitter page: "On behalf of everyone involved in La Roux, our hearts go out to the family and loved ones of @ouestleswimmingpool. â‚¬lly x"

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Ellie Goulding wrote on her Twitter page: "RIP, Charlie x"

The band were in the middle of a tour of European festivals. Haddon's death was confirmed on Pukkelpop's official website.